public async Task<EnhanceResult> EnhanceAsync(Frame frame)
{
using (var bitmap = new Bitmap(new Windows.Foundation.Size(frame.Dimensions.Width, frame.Dimensions.Height), Internal.Utilities.FrameFormatToColorMode(frame.Format), frame.Pitch, frame.Buffer.AsBuffer()))
using (var source = new BitmapImageSource(bitmap))
using (var effect = new FilterEffect(source))
using (var renderer = new BitmapRenderer(effect))
{
effect.Filters = new List<IFilter>()
{
new ContrastFilter(0.5)
};
using (var newBitmap = new Bitmap(new Windows.Foundation.Size(frame.Dimensions.Width, frame.Dimensions.Height), Internal.Utilities.FrameFormatToColorMode(frame.Format)))
{
await effect.GetBitmapAsync(newBitmap, OutputOption.PreserveAspectRatio);
return new EnhanceResult()
{
Frame = new Frame()
{
Buffer = newBitmap.Buffers[0].Buffer.ToArray(),
Pitch = newBitmap.Buffers[0].Pitch,
Format = frame.Format,
Dimensions = newBitmap.Dimensions
}
};
}
}
}
public async Task<NormalizeResult> NormalizeAsync(Frame frame, Windows.Foundation.Rect area, double rotation)
{
using (var bitmap = new Bitmap(frame.Dimensions, Internal.Utilities.FrameFormatToColorMode(frame.Format), frame.Pitch, frame.Buffer.AsBuffer()))
using (var source = new BitmapImageSource(bitmap))
using (var effect = new FilterEffect(source))
using (var renderer = new BitmapRenderer(effect))
{
effect.Filters = new List<IFilter>()
{
new ReframingFilter(area, -rotation)
};
using (var newBitmap = new Bitmap(new Windows.Foundation.Size(area.Width, area.Height), Internal.Utilities.FrameFormatToColorMode(frame.Format)))
{
await effect.GetBitmapAsync(newBitmap, OutputOption.PreserveAspectRatio);
return new NormalizeResult()
{
Frame = new Frame()
{
Buffer = newBitmap.Buffers[0].Buffer.ToArray(),
Pitch = newBitmap.Buffers[0].Pitch,
Format = frame.Format,
Dimensions = newBitmap.Dimensions
},
Translate = new Func<Windows.Foundation.Point, Windows.Foundation.Point>((normalizedPoint) =>
{
var rotationRadians = -rotation / 360.0 * 2.0 * Math.PI;
var sin = Math.Sin(rotationRadians);
var cos = Math.Cos(rotationRadians);
var origoX = area.Width / 2.0;
var origoY = area.Height / 2.0;
// Translate point to origo before rotation
var ox = normalizedPoint.X - origoX;
var oy = normalizedPoint.Y - origoY;
// Move area to origo, calculate new point positions, restore area location and add crop margins
var x = ox * cos - oy * sin;
var y = ox * sin + oy * cos;
// Translate point back to area after rotation
x = x + origoX;
y = y + origoY;
// Add margins from original uncropped frame
x = x + area.X;
y = y + area.Y;
return new Windows.Foundation.Point(x, y);
})
};
}
}
}
public async Task<DecodeResult> DecodeAsync(Frame frame)
{
var result = await Task.Run<ZXing.Result>(() =>
{
var width = 0;
if (frame.Format == FrameFormat.Bgra32)
{
width = (int)frame.Dimensions.Width;
}
else if (frame.Format == FrameFormat.Gray8)
{
width = (int)frame.Pitch;
}
else
{
throw new ArgumentException(String.Format("Incompatible frame format: {0}", frame.Format.ToString()));
}
return _reader.Decode(frame.Buffer, width, (int)frame.Dimensions.Height, FrameFormatToBitmapFormat(frame.Format));
});
if (result != null)
{
var decodeResult = new DecodeResult()
{
Text = result.Text,
Data = result.RawBytes,
Format = result.BarcodeFormat.ToString()
};
if (result.ResultPoints != null && result.ResultPoints.Length > 0)
{
decodeResult.InterestPoints = new List<Windows.Foundation.Point>();
foreach (ZXing.ResultPoint point in result.ResultPoints)
{
decodeResult.InterestPoints.Add(new Windows.Foundation.Point(point.X, point.Y));
}
}
return decodeResult;
}
else
{
return null;
}
}
public virtual async Task<ProcessResult> ProcessAsync(Frame frame, Windows.Foundation.Rect area, double rotation)
{
var timedExecution = new Internal.TimedExecution();
var normalizeTime = new TimeSpan(0);
var enhanceTime = new TimeSpan(0);
var decodeTime = new TimeSpan(0);
NormalizeResult normalizeResult = null;
if (Normalizer != null)
{
normalizeResult = await timedExecution.ExecuteAsync<NormalizeResult>(
Normalizer.NormalizeAsync(frame, area, rotation).AsAsyncOperation());
normalizeTime = timedExecution.ExecutionTime;
frame = normalizeResult.Frame;
}
if (Enhancer != null)
{
var enhanceResult = await timedExecution.ExecuteAsync<EnhanceResult>(
Enhancer.EnhanceAsync(frame).AsAsyncOperation());
enhanceTime = timedExecution.ExecutionTime;
frame = enhanceResult.Frame;
}
var decodeResult = await timedExecution.ExecuteAsync<DecodeResult>(
Decoder.DecodeAsync(frame).AsAsyncOperation());
decodeTime = timedExecution.ExecutionTime;
#if DEBUG
System.Diagnostics.Debug.WriteLine(String.Format(
"Normalizing took {0} ms, enhancing took {1} ms, decoding took {2}, which totals to {3} ms",
(int)normalizeTime.TotalMilliseconds, (int)enhanceTime.TotalMilliseconds, (int)decodeTime.TotalMilliseconds,
(int)(normalizeTime + enhanceTime + decodeTime).TotalMilliseconds));
#endif // DEBUG
if (DebugFrameAvailable != null)
{
DebugFrameAvailable(this, new DebugFrameEventArgs() { DebugFrame = frame });
}
if (decodeResult != null)
{
var interestPoints = decodeResult.InterestPoints;
if (interestPoints != null)
{
if (normalizeResult != null && normalizeResult.Translate != null)
{
var translatedInterestPoints = new List<Windows.Foundation.Point>();
foreach (var point in interestPoints)
{
translatedInterestPoints.Add(normalizeResult.Translate(point));
}
interestPoints = translatedInterestPoints;
}
}
return new ProcessResult()
{
Data = decodeResult.Data,
Format = decodeResult.Format,
Text = decodeResult.Text,
InterestPoints = interestPoints
};
}
else
{
return null;
}
}
